Chamfer strip for concrete forms



July 11, 1961 s. J. STILES 2,991,532

CHAMFER STRIP FOR CONCRETE FORMS Filed Dec. 1, 1959 2 Sheets-Sheet 1 INVENTOR SAMUEL J. STILES ATTORNEY July 11, 1961 s. J. STILES 2,991,532 CHAMF'ER STRIP FOR CONCRETE FORMS Filed Dec. 1, 1959 2 Sheets-Sheet 2 FIG. 7 55 INVENTOR SAMUEL J. STILES FIG.GA/&ZWWVO&

ATTORNEY United States Patent 2,991,532 CHAMFER STRIP FOR CONCRETE FORMS Samuel J. Stiles, 2201 Pennsylvania Ave., Philadelphia, Pa. Filed Dec. '1, 1959, Ser. No. 856,391 5 Claims. (Cl. 25-118) Broadly, this invention relates to the art of pouring concrete and, specifically, it relates to what is known in the trade as chamfer strip which is used in connection with concrete forms to predetermine the shape, or the topography, of the finished concrete structure.

In pouring concrete, it is sometimes desirable to provide fluted surfaces, or round instead of sharp angled junctions of adjacent walls, etc. The effects referred to are sometimes intended for decorative purposes and sometimes for utilitarian purposes. For example, the flutes can be used as keys for receiving material into which nails or screws can be driven or for spacing abutting surfaces to provide air spaces therebetween, etc.

To the best of my knowledge, and after many years of experience in the building trade, it has heretofore been the practice to fabricate the chamfer strip according to the requirements of each particular job. For example, if it was desired to flatten, or to round out, the junction of two walls, it was necessary to fabricate a flat or a round chamfer strip of the desired size and form and to secure it to the form into which concrete is to be poured. This meant that new chamfer strips had to be built for each job and, when the price of wood and when the wages of a skilled carpenter and his helpers are considered, it can be seen that the cost of providing chamfer strips greatly increases the cost of the pouring operation.

It is, therefore, one object of this invention is to produce a number of pre-fabricated chamfer strips which can produce any one of a number of eflects, or any combination of effects and which can be used over and over again, thus eliminating the high cost of labor and material which are involved in on the-job fabrication of chamfer strips and molds. Moreover, the precision components of my invention insure uniform perfection of the finished product which is not attainable except, perhaps, by the most skilled carpenters.

A still further object of the invention is to produce improved, prefabricated means which can be repeatedly used for detachably and readily securing prefabricated chamfer strip to concrete-receiving forms, and which are equally readily dismantled and stored for subsequent use.

The full nature of the invention will be understood from the following specification and the accompanying drawings in which:

FIGS. 1 to 6 are fragmentary horizontal sectional views showing portions of concrete forms, each using a different type chamfer strip embodying the invention.

FIGS. 1A to 6-A are fragmentary perspective views showing the chamfer strips used in FIGS. 1 to 6 respectively.

FIG. 7 is an elevational view of the strip shown in FIG. 5 and the brackets for securing it to a concretereceiving form.

In FIGS. 1 to 6, reference numerals 10 and 1 designate the walls which constitute one side of a concrete form and numerals 14 and 16 designate the walls which constitute the opposite side of said form. The walls referred to are suitably buttressed against the weight of the concrete poured therebetween by suitable frame-work formed of horizontal and vertical joists 18 and 20. Since the concrete form itself and its re-inforcement are conventional and form no part of the present invention, they are not shown nor described in further detail. When it is not desired to produce any specific efiects, that is, for

2,991,532 Patented July 11 1961 'ice examp1e, when a flat surfaced wall, or when a right angled junction is desired, no chamfer strip is used. If it is desired to produce some special effect in the surface of a wall or at the junction of adjacent walls, one or the other of the chamfer strips or molds illustrated, will be used.

Strip B of FIGS-1 and l-A, includes an elongated body portion 22 having flat surfaces 24 and a'concave surface 26 against which the concrete is poured, and limbs 28 and 30 which abut walls 10 and 12 of the form respectively. 1 v

Strip C of FIGS. 2 and 2-A includes anelongated piece 32 against which the concrete is poured and limbs 34 and 36 which abut walls 10 and 12 of the form, re spectively. 1

Strip D of FIGS. 3 and 3-A includes an elongated body portion 40, a right angle limb 42' which abuts ,wall 12 and the edge 43 of which abuts wall 10 of the form, and an arcuate end portion 44, the edge 45 of'which abuts wall 10 of the form.

Strip E of FIGS. 4 and 4-A, includes an elongated body portion 46 against which the concrete is poured and one edge 46a of which abuts wall 10, and limb 47 which abuts wall 12 and the edge of which abuts wall 10 of the form.

Strip F of FIGS. 5 and 5-A includes two angularly disposed limbs 50 and 52 against which concrete is poured and the edges 55 of which abut wall 10 or 12 of the form.

Strip G of FIG. 6 and 6-A includes an arcuate body portion 56 against which concrete is poured and the edge 57 of which abuts wall 12, and limb 58 of which abuts wall 10, and the edge 59 of which abuts wall 12 of the form.

The concrete facing portions of strips B, D, E, F and G are secured in position by means of spaced brackets in the manner best shown in FIG. 5. While they differ in minor details, each of the brackets includes a body portion 60 which may abut wall 10 or Wall 12 as in FIGS. 4 and 6, or angled walls 62 and 63, which abut walls 10 and 12, as in FIGS. 4 and 5. In all embodiments, the ends of the brackets are provided with fingers 64 which are adapted to engage recesses 66 in the corresponding limbs of the concrete facing portions, as shown in FIGS. 1, 3, 4, 5 and 6 or with round detents 68 which are adapted to engage recess 70.

In all of the embodiments, at least the parts of the chamfer strips which come in contact with the poured concrete are formed of a smooth, non-adhering, nonreacting synthetic or metallic material having the necessary resiliency. For example, slightly springy, sheet metal can be used, or the parts can be molded, or extruded, from a synthetic material such as methyl methacrylate, or any of the other numerous synthetic materials which can be molded or extruded to produce light and resilient components which can resist the pressures to which they will be subjected in actual use but which can be somewhat distorted or deflected.

Since the various chamfer strips are used in generally the same manner, it is thought that a description of the strips of FIGS. 1 and 5 will sufiice.

To use the strip of FIG. 1 side wall 62, or side wall 63 of each of the spaced brackets shown in FIG. 7 is nailed, as at 65, or otherwise detachably secured, to wall 10, or to wall 12, of the concrete-receiving form and strip or member 22 is secured to the brackets by engaging one margin of the strip to one Wall 62 of each bracket and then distorting the strip to engage its opposite margin with wall 63 of the bracket.

To use the devices of the other embodiments, wall 60 of the bracket is nailed to a wall of the form, as at 65, and the fingers 64, or detents 68, are engaged with recesses 66 or 10 near one margin of the corresponding strip D, E, F or G, and the opposite fingers of the brackets are snapped into engagement with the opposite margin of the strip, After the concrete has set enough, the form is dismantled. Since all of the concrete facing portions are so shaped as not to be interlocked with the concrete, the entire chamfer strip will come off with the wallof the concrete receiving form to which they are attached.

It will be evident that, byhaving a set of charnfer strips of different shapes, various effects can be produced, and

because my chamfer strips ycan beused over and over again, considerable savingof material iseffected and uniform results are obtained.

What I claim is;

LA chamfer device for use with aform for pouring concrete, said device including an elongated member formed of a resilient, non-concrete adhering member and including at least'one concrete molding surface, said elongated member having opposed, longitudinally spaced notches disposed near, and inwardly of, the opposite edges thereof, a plurality of brackets for detachably securing said elongated member to said form, each of said brackets including a body portion and fingers carried by the pposite edges of said body portion and detachably engageable with said notches, and means securing said brackets to said form, said notches and fingers being so related that, when said fingers engage said notches, the edges of said elongated member will abut said form.

2. The structure recited in claim 1 in which the concrete molding surface of said elongated memberis convex.

3. The structure recited in claim 1 in which the concrete molding surface of said elongated member is concave.

4. The structure recited in claim 1 in which said member is forrned of at least two, angularly related, walls.

5. The structure recited in claim 4 in which the notches in one of said walls are nearer to the edge thereof than notches in the other wall are to the edge thereof.

References Cited in the file of this patent UNITED STATES PATENTS 1,220,083 Fouse Mar 20, 1917 1,574,483 Hirshstein Feb. 23, 1926 1,807,315 Knutson May 26,- 1931 2,053,555 Hall Sept. 8, 1936 2,155,128 Gray Apr. 18, 1939 2,948,062 Tinnerman Aug. 9, 1960 2,948,938 Holton Aug. 16, 1960 2,953,835 Armstrong et al. Sept. 27, 1960 

